850 xp oil in air box, what is the final outcome?

Hi guys, I’ve read a ton of threads here but can’t decipher what the final outcome or solution was?
Some threads talk about scoring of cylinders
Some threads talk about 2012 having a completely new engine design (beyond the 7 hp upgrade)
Some talk about re seating the pvc using lube
Some talk about a list of parts from the 2012 that can be retrofitted on the 2011

I just bought a 2011 and have a bit of oil in the air box (nothing like some of those scary photos) and I want to cure it.

Please let me know if you solved the issue and if so how?
If its parts can you send the list or direct me to the resource?